Grinding machine



July 31, 1945.

P. H. HUTCHINSON GRINDING MACHINE Filed Sept. 29, 1944 2 Sheets-Sheet 2 BY FW Patented July 31, 1945 GRINDING MACHINE ramp :1. Hutchinson, Montclair, N. 1., asslgnor to General Motors Corporation, Detroit, Mich, a corporation of Delaware Application September 29, 1944, Serial No. 556,310

- 11 Claims. (01. 511-103) This invention relates to grinding machines and comprises all of the features of novelty herein disclosed. Anobject of the invention is to provide an improved machine for grinding an outwardly projecting flange on a work piece. especially an overhanging conical face on the flange of an inner race ring forttapered roller bearings. Another object is to provide improved means for supporting and rotating the piece so that the flange may be accurately ground in predetermined relation to previously finished surfaces on the piece. Another object is to provide improved means to grind a conical surface in concentric relation to another surface on a circular work piece and to locate the ground surface at a predetennined position axially of the work piece.

To these ends andalso to improve generally upon machines of this character, the invention consists in the various matters hereinafter described and claimed. In its broader aspects, the invention is not necessarily limited to the specific construction selected for illustrative purposes in the accompanyin drawings in which Fig. 1 is a front elevation of the machine, some parts being broken away and some being sectioned.

Fig. 2 is an end elevation, the work and the grinding wheel being omitted.

Fig. 3 is an enlarged vertical section of a pressure roller mounting and associated parts.

Fig. 4 is an enlarged end view of the work supporting and rotating means.

Fig. 5 is a horizontal section of Fig. 4.

The illustrated work piece W is an inner race ring for tapered roller bearings wherein a conical raceway 2 lies between outwardly extending flanges. The overhanging. or internal conical face 4 of the larger flanse is the surface to be ground and grinding is efl'ected by the conical 36 and a guard 38 protect the bearing 28 grinding wheel is fed hardened material brazed in radial grooves on a ring I 4 fastened by screws to a housing IS. The ribs accurately locate the piece endwise while the against the face 4 until the face is ground to a definite distance from the finished end ofthe piece. The accurate location of the face 4 is important because it engages the ends of the bearing rollers and. guides them.

To hold the work in contact with the regulating wheel for controlled rotation, a crowned pressure idler roll 20 is yieldably urged against the cylindrical bore of the piece. The roll is crownedso that it will have only point contact with the bore and thus have no tendency to displace the piece from its predetermined location as determined by the previously finished faces. The roll is keyed to a rotary spindle 22 and is clamped against a shoulder by a cupped washer 2,4 which is fastened by a screw 26. The spindle is journalled by ball bearings 28 and ll in a housing 32, the outer race ring of the bearing 30 being slidable and urged axially by spring washers 34'. A labyrinth seal I while a cap protects the bearing 30. v The housing 32 is secured in the housing It by a split portion 42 on the latter as shown inFig. 1. The outer housing is welded to or otherwise formed on the lower end of an arm 44' which is slidable endwise in a guide block 48 which has a split portion 48 clamped to a rock shaft II. The arm is slid to adjusted position by a screw 82 journalled in a bracket 54 on the block 46,.the

' pressure comes on the conical regulating wheel 8 edge 8 of a grinding wheel G whose central plane is parallel to the work axis and fed in this plane. The conical raceway 2 is previously finished ground and the larger end face of the piece is finished flat, these finished surfaces being utilized to locate the piece accurately for the grinding operation on the flange.

A regulating wheel I having a conicel flange engages the conical raceway 2 at one side of the piece while beneath the piece and somewhat to the other side is a work blade Ill whose upper surface is fiat but inclined in two directions as indicated in Figs. 3 and 4 to have line contact with the finished raceway 2. The fiat end face of the piece engages .a series of radial ribs I! of ried by. a housing in which the spindle of the regulating wheel is journalled, this spindle being driven by a' belt pulley 62. One end of the rock shaft has a forwardly projecting arm 64 connected by a spring 66 to the work head base 81. The tension of the spring can be adjusted by. a screw to regulate the pressure of the idler roll 20 against the work. This pressure can be relieved to release the work and lift it from its supports by a ball-ended strut or rod 68 engaging a socket in a screw 10 and a socket in a vertical plunger 12, the latter having a cam roller 14 adapted to be engaged by a cam 16 on a sliding table II cam turns on roller bearings 04" and its bore is eccentric to the exterior so that a gradual advance of the table occurs as the cam is turned and as the table and grinding wheel are urged forwardly. Compensation for wear of the grinding wheel can be effected by turning the screw I by a knurled head 80 having a dial. The handle 88 is urged counterclockwise against a stop 08 by a spring I when the table again retreats, thus to set the cam for feeding of the grinding wheel against the next piece.

The work blade it has a horizontal base ll! clamped by screws in a vertical slot of a plate iill welded to an inclined slide Ill which is adjusted on an incline by a screw Ill. and secured I in adjusted position by a clamp 0. This adjustment enables work pieces of different diameters to be located at the desired level, the axis of the piece preferably being in the horizontal plane which includes the axis of the grinding wheel and the axis of the regulating wheel.

I claim:

1. In a machine for grinding a projecting face on the exterior of a ring, a regulating wheel engaging the exterior of the ring on one side, a grinding wheel extending substantially parallel to the ring axis on the other side of the ring and having its periphery engaging the projecting face. an abutment engaging one end of the ring in opposition to the wheel, a blade co-oper- .ating with the regulating wheel to support the ring for rotation, and a rotatabl pressure roll extending into the bore of the ring in opposition to the regulating wheel.

2. In a machine for grinding a projecting face on the exterior of a ring, means engaging the exterior of the ring to support it for rotation on trolled rotation on its axis, a non-rotary abutment engaging one end of the ring to locate it axially, and a grinding wheel having a peripheral face adapted to have controlled approach towards the butment.

4. In a machine for grinding a projecting face on the exterior of a ring, a regulating wheel and a blade engaging the exterior of the ring for controlled rotation on its axis, a pressure roll" when the latter, which carries the grinding wheel,

port the ring for controlled rotation on its axis, an abutment engaging the end of the ring to locate it axially, a pressure roll proiecing into and engaging the bore of the ring forurging the ring against the regulating wheel, and a grinding wheel having a peripheral face adapted to engage the projecting face and have controlled approach towards the abutment.

6. In a machine for grinding a projecting face on the exterior of a ring, a regulating wheel and a blade engaging the exterior of the ring to support the ring for controlled rotation on its axis, an abutment engaging the end of the ring to locate it axially, a grinding wheel having a peripheral face adapted to have controlled approach towards the abutment, a pressure roll projecting into and engaging the bore of the ring for urging the ring against the regulating wheel, and a movable carrier supporting both the abutment and the pressure roll.

7. In a machine for grinding a projecting face on the exterior of a ring, a regulating wheel and a blade engaging the exterior Of the ring to support the ring for controlled rotation on its axis, an abutment engaging the end of the ring to locate it axially, a grinding wheel having a peripheral face adapted to have controlled approach towards the abutment, a hollow carrier for supporting the abutment, a Pressure roll engaging the bore of the ring for urging the ring against the regulating wheel, and a spindle supporting the pressure roll and joumalled for rotation in the hollow carrier. I

8. In a machine for grinding a projecting face on the exterior of a ring, a regulating wheel and a blade engaging the exterior of the ring to support the ring for controlled rotation on its axis, an abutment having a plurality of ribs arranged in a plane to engage the end of the ring and locate it axially, a grinding wheel having a peripheral face adapted to have controlled approachtowards the ribs, and a pressure roll extending into the bore of the ring and movable towards and from the regulating wheel.

9. In a machine for grinding an overhanging conical face projecting from the exterior of a ring, a regulating wheel and a work blade engaging the exterior of the ring to support the ring for controlled rotation on its axis, an abut ment engaging the end of the ring and axially locating the ring, a pressure roll engaging the bore of the ring and pressing it against the regulating wheel, a grinding wheel having a conical periphery engagi g the conical face, and means for controlling peripheral approach of the wheel towards the abutment.

10. In a machine for grinding an overhanging conical face projecting from the tapered exterior of a ring, a regulating wheel and a work blade engaging the tapered exterior of the ring to support it for controlled rotation on its axis, an abutment engaging the ,end of the ring and locating the ring axially, a pressure roll engaging the bore of the ring, means for urging the pressure roll in a direction to apply the major pressure of the ring against the regulating wheel with a minor pressure against the work blade, the regulating wheel and the blade having surfaces inclined with respect to the axis of the ring to cause a resultant endwise pressure of the ring against the abutment, and a grinding wheel movable parallel to the ring axis and having a conical face adapted to feed into the overhanging conical face of the ring.

a pressure roll having a crowned periphery engaging the bore 0! the ring andurging the ring against the regulating wheel, and a grinding wheel having a conical periphery adapted to ensage and grind the conical face to a predetermined distance trom the end of the ring.

PHILIP H. HU'ICEIINBON. 

